LLROUND(3M) | Mathematical Library Functions | LLROUND(3M) |

llround, llroundf, llroundl - round to nearest integer value

c99 [flag... ]file...-lm[library... ] #include <math.h>long longllround(doublex);

long longllroundf(floatx);

long longllroundl(long doublex);

These functions rounds their argument to the nearest integer value, rounding halfway cases away from 0 regardless of the current rounding direction.

Upon successful completion, these functions return the rounded integer
value.

If *x* is NaN, a domain error occurs and an unspecified value
is returned.

If *x* is +Inf, a domain error occurs and an unspecified
value is returned.

If *x* is -Inf, a domain error occurs and an unspecified
value is returned.

If the correct value is positive and too large to represent as a
**long** **long**, a domain error occurs and an unspecified value is
returned.

If the correct value is negative and too large to represent as a **long**
**long**, a domain error occurs and an unspecified value is returned.

These functions will fail if:

**Domain Error**

The *x* argument is NaN or ±Inf, or the
correct value is not representable as an integer.

If the integer expression (**math_errhandling** &
**MATH_ERREXCEPT**) is non-zero, then the invalid floating-point
exception will be raised.

An application wanting to check for exceptions should call
**feclearexcept**(**FE_ALL_EXCEPT**) before calling these functions.
On return, if **fetestexcept**(**FE_INVALID** | **FE_DIVBYZERO** |
**FE_OVERFLOW** | **FE_UNDERFLOW**) is non-zero, an exception has been
raised. An application should either examine the return value or check the
floating point exception flags to detect exceptions.

These functions differ from the llrint(3M) functions in
that the default rounding direction for the **llround()** functions round
halfway cases away from 0 and need not raise the inexact floating-point
exception for non-integer arguments that round to within the range of the
return type.

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE | ATTRIBUTE VALUE |

Interface Stability | Standard |

MT-Level | MT-Safe |

math.h(3HEAD), feclearexcept(3M), fetestexcept(3M), llrint(3M), lrint(3M), lround(3M), attributes(7), standards(7)

July 12, 2006 | SunOS 5.11 |